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Adding trailer wiring usually means tapping into your vehicle’s circuits, but this harness eliminates that step. The Curt T-Connector plugs in behind the tail lights using factory-style connectors to create a 4-flat trailer plug. There’s no splicing or guessing which wire does what—just plug it in and you’re ready to tow.
Modern vehicles don’t like extra electrical load on their lighting system. This harness includes a powered converter that draws power directly from the battery through its own fuse. That way, the trailer lights get a clean 12-volt feed while your vehicle’s wiring stays protected from overloads or shorts.
Once installed, the 4-flat connector provides running light, turn signal, and brake light functions to any small or mid-size trailer. It’s the standard setup for most utility trailers, boat trailers, and campers, giving you all the signals needed for safe towing on the road.
The included black power wire runs straight to the positive terminal on the battery. It’s a straightforward route that ensures the converter always has reliable power. With solid grounds and a dedicated fuse holder, you get consistent performance without flickering or dim lights.
If you ever step up to a trailer with electric brakes or need a 12-volt charge line, this 4-way harness can be paired with kits like the ETBC7 to add a full 7-way connector. That means you can start simple and expand later without redoing the wiring you’ve already installed.
Customer Satisfaction Score:
97% were satisfied with this product
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Ratings & Reviews
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Mark M.
2/3/2020
Still working as advertised. No issues at all.